4 Installing 7890 GC Columns
To Install a Capillary Column in the GC/MS Interface Using a Standard Column Nut
7000/7010 Series TQ GC/MS Operating Manual 87
Procedure
1 Condition the column. (See “To Condition a Capillary Column” on page 79.)
2 Vent the MS and open the front analyzer chamber. (See “To Vent the MS” on
page 124 and “To Open the Front Analyzer Chamber” on page 156.) Ensure
you can see the end of the GC/MS interface.
3 Remove the interface tip seal, spring, and knurled tip seal retainer from the
GC/MS interface. (See Figure 20 and Figure 21 on page 83.)
4 Slide an interface nut and conditioned ferrule onto the free end of the GC
column. The tapered end of the ferrule must point towards the nut.
5 Slide the column into the GC/MS interface.
6 Hand-tighten the nut.
7 Use the column cutter to score the column 2 cm from the end.
8 While holding the column against the column cutter with your thumb, break
the column against the edge of the column cutter.
9 Inspect the end for jagged edges or burrs. If the break is not clean and even,
repeat steps 6 and 7.
Always wear clean gloves while handling any parts that go inside the GC or the
analyzer chambers.
The analyzer, GC/MS interface, and other components in the analyzer
chamber operate at very high temperatures. Do not touch any part until you
are sure it is cool.
Electrostatic discharges to analyzer components are conducted to the side
board where they can damage sensitive components. Wear a grounded
antistatic wrist strap, and take other antistatic precautions before you open the
analyzer chamber.
The GC operates under high temperatures. Do not touch any GC parts unless
you are certain they are cool.
Do not break the column off inside the vacuum manifold. Pieces of column
could fall or be pulled into the turbo pump and damage it.
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